Update mode

This mode evaluates the config spec against all the files and directories in the snapshot view and does the following:

• If a version selected by the config spec is different from the version in the view, the Update Tool copies the version from the VOB to the view and overwrites the existing version.
• Removes any elements that are no longer selected by the view.
• Operates on hijacked files according to the options set on the Advanced page of the Start Update window.